B&G Deckman - Manual (Page 139)

Chapter 9: Wind and current forecasts
9.12
Basic operation
To use this feature select menu>view>make Grid and then select
whether you wish to create a wind or current forecast. You will then
get some extra boxes along the bottom of the Navigation display. It is
easiest to begin by using the zoom tools so that the whole area you wish
to forecast for is visible on the screen. You then enter data within this
area as described below.
If you enter data into the Speed and Dirn boxes (for wind these are
‘from’, for current ‘to’) at the bottom of the display and then click on the
chart itself, a point (‘node’) will be created with the characteristics
specified. It is also possible to click and drag: points will be put down
with the speed specified in the box, with the direction determined by the
movement of the cursor. Note that for currents, you draw in the direction
of the current (i.e. ‘to’); for wind you must draw into the wind (i.e. the
direction the wind is coming ‘from’). This is necessary to keep with the
conventions of how wind and current directions are generally labelled.
The Arrows box turns the arrows associated with each point on or off,
and the Preview box allows you to see Deckman’s interpolation
between the points you enter. The Grid Res box allows you to specify
how ‘dense’ you wish the interpolated mesh to be; units are degrees,
with smaller numbers therefore giving more detail. Selecting an
individual node (clicking on it – it will turn green when cursor is in the
correct position) allows you to make changes to the individual node:
change speed or direction, or delete.
The Actions menu gives the following options:
Load
Nodes Opens a previously saved node file (as saved using
Save Nodes below)
Save
Nodes Saves the present data from the nodes; file
extension is .nod. See below for more information.
Save to
Grid Saves the present data from the nodes in a format
that can be used by Deckman in Planning; file
extension is .cgf. See below for more information.